Roll Observatory packages and add a roll script

packages/petitparser/lib/src/reflection/iterable.dart

-part of reflection;
+part of petitparser.reflection;
 
-/**
- * Returns a lazy iterable over all parsers reachable from a [root].
- *
- * For example, the following code prints the two parsers of the
- * defined grammar:
- *
- *     var parser = range('0', '9').star();
- *     allParser(parser).forEach((each) {
- *       print(each);
- *     });
- *
- */
+/// Returns a lazy iterable over all parsers reachable from a [root].
+///
+/// For example, the following code prints the two parsers of the
+/// defined grammar:
+///
+///     var parser = range('0', '9').star();
+///     allParser(parser).forEach((each) {
+///       print(each);
+///     });
+///
 Iterable<Parser> allParser(Parser root) => new _ParserIterable(root);
 
 class _ParserIterable extends IterableBase<Parser> {
   final Parser root;
 
   _ParserIterable(this.root);
 
   @override
   Iterator<Parser> get iterator => new _ParserIterator([root]);
 }
@@ skipping 18 matching lines @@
     current = todo.removeLast();
     for (var parser in current.children) {
       if (!seen.contains(parser)) {
         todo.add(parser);
         seen.add(parser);
       }
     }
     return true;
   }
 }